In C4 photosynthesis, the first stable compound formed after CO2 fixation is:

The correct answer is B: Oxaloacetate. In C4 plants, PEP carboxylase fixes CO2 into oxaloacetate (4-carbon compound), unlike C3 plants where RuBisCO produces 3-PGA. This adaptation reduces photorespiration and is efficient in hot climates.

The pulling force that moves water upward in xylem vessels is primarily due to:

The correct answer is C: Transpirational pull (tension) in xylem. Cohesion-tension theory explains that water is pulled upward due to transpirational pull creating negative pressure in xylem.

What is the angle of incidence when light ray falls on a plane mirror and the angle of reflection is 35°?

The correct answer is A: 35°. According to law of reflection, angle of incidence equals angle of reflection

The rate of photosynthesis increases with increasing CO2 concentration only up to a certain point. This point is called:

The correct answer is A: Saturation point. CO2 saturation point is where further increase in CO2 doesn't increase photosynthesis rate because other factors (like enzyme activity) become limiting. Compensation point is where photosynthesis equals respiration.

Planet closest to Sun?

The correct answer is B: Mercury. Mercury is closest to Sun.

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Showing 71–74 of 74 questions

Q.71 Easy Physics

A car accelerates from rest at 2 m/s². How long does it take to reach 20 m/s?

A5 seconds

B10 seconds

C15 seconds

D20 seconds

Correct Answer: B. 10 seconds

Explanation:

This problem uses the kinematic equation relating velocity, acceleration, and time for motion starting from rest.

Step 1: Identify the Given Values

We are given the initial velocity (starting from rest), final velocity, and acceleration. We need to find the time taken.

v_i = 0 \text{ m/s}, \quad v_f = 20 \text{ m/s}, \quad a = 2 \text{ m/s}^2, \quad t = ?

Step 2: Apply the Kinematic Equation

Using the equation that relates final velocity, initial velocity, acceleration, and time:

\[v_f = v_i + at\]

Substituting the values:

\[20 = 0 + (2)(t)\]

\[20 = 2t\]

t = \frac{20}{2} = 10 \text{ seconds}

The car takes 10 seconds to reach 20 m/s. The answer is (B) 10 seconds.

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Q.72 Easy Physics

Which of the following statements about gravitational force is correct?

AGravitational force is repulsive in nature

BGravitational force depends on the medium between objects

CGravitational force is always attractive

DGravitational force acts only between charged objects

Correct Answer: C. Gravitational force is always attractive

Explanation:

Gravitational force is always attractive, acts between any two masses, is independent of the medium, and is governed by Newton's law of universal gravitation.

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Q.73 Easy Physics

Which of the following has the highest refractive index?

AAir

BWater

CDiamond

DGlass

Correct Answer: C. Diamond

Explanation:

Refractive indices: Air ≈ 1, Water ≈ 1.33, Glass ≈ 1.5, Diamond ≈ 2.42. Diamond has the highest refractive index among these options.

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Q.74 Easy Physics

A current of 5 A flows through a resistor for 10 seconds. How much charge passes through it?

A0.5 C

B2 C

C50 C

D500 C

Correct Answer: C. 50 C

Explanation:

Charge Q = I × t, where I = 5 A and t = 10 s. Q = 5 × 10 = 50 Coulombs.

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